🔧 Spark Plugs - Replacement

Your V6 uses six spark plugs, and the rear bank is tighter to reach on the coupe. This job is straightforward, but clean work and correct torque matter to avoid stripping the aluminum cylinder heads or cracking a coil boot.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

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⚠️ Safety & Precautions

• Work on a completely cool engine. Hot aluminum threads can be damaged easily.
• Disconnect the negative battery cable before removing ignition coils.
• Do not drop dirt into the spark plug wells.
• Use only a spark plug socket with a rubber insert or magnet.
• Do not overtighten the plugs. The cylinder head is aluminum.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 8mm socket
• Ratchet
• 3-inch extension
• 6-inch extension
• 10mm wrench
• Spark plug socket 5/8-inch
• Torque wrench
• Trim clip tool
• Compressed air nozzle
• Dielectric grease
• Gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs - Qty: 6

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully.
• Open the hood and remove any engine cover panels before starting.
• Disconnect the negative battery cable with a 10mm wrench.
• Keep dirt out of the plug wells.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine covers

• Use a 10mm socket or trim clip tool to remove the upper engine cover and any intake ducting that blocks access.
• Set all fasteners aside in order.

Step 2: Disconnect the battery

• Use a 10mm wrench to disconnect the negative battery cable.
• Move the cable aside so it cannot touch the post.

Step 3: Remove ignition coils

• Use an 8mm socket to remove each ignition coil bolt.
• Twist each coil gently and pull it straight up.
• Label the coils if needed so they go back in the same spots.

Step 4: Clean the plug wells

• Use compressed air to blow dirt out of each spark plug well.
• Do this before removing the plugs so debris does not fall into the cylinder.

Step 5: Remove the old spark plugs

• Use a 5/8-inch spark plug socket, ratchet, and extension to loosen and remove each plug.
• If a plug feels stuck, work it slowly back and forth.
• Do not force a tight plug.

Step 6: Install the new spark plugs

• Thread each new plug in by hand first using the spark plug socket and extension.
• If you feel resistance right away, stop and restart by hand.
• Once seated, tighten each plug with a torque wrench to 18 Nm (13 ft-lbs).

Step 7: Reinstall the ignition coils

• Add a small amount of dielectric grease inside each coil boot.
• Push each coil straight down onto its plug.
• Install the coil bolts with an 8mm socket and tighten to 12 Nm (9 ft-lbs).

Step 8: Reassemble the engine bay

• Reconnect any intake ducting and reinstall the engine cover using the 10mm socket or trim clip tool.
• Reconnect the negative battery cable with a 10mm wrench.

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✅ After Repair

• Start the engine and listen for a smooth idle.
• Check for misfire, rough running, or a flashing check engine light.
• If the engine shakes or runs rough, recheck coil seating and plug torque.
• Take a short test drive and confirm normal acceleration.

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💰 DIY vs Shop Cost

Shop Cost: $250-$500 (parts + labor)

DIY Cost: $60-$120 (parts only)

You Save: $190-$380 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 hours.

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🎯 Ready to get started?

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